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Node 2, 3 (Harmony, Tranquility)

The installation of NASA's Node 2 (Harmony) denotes the U.S. Core Complete stage of International Space Station assembly and increases the living and working space inside the station to
approximately 500 cubic meters. It also allows the addition of international laboratories
from Europe and Japan to the station.

Node 2 provides a passageway between four station science experiment facilities: the
U.S. Destiny Laboratory, the Kibo Japanese Experiment Module, the
European Columbus Laboratory and the Centrifuge Accommodation
Module. It also provides connecting ports for Multi-Purpose Logistics
Modules, the Japanese HTV and the Pressurized Mating Adapter 2
to which space shuttles dock. The Space Station Robotic Arm, Canadarm2, can operate from a
powered grapple fixture on the exterior of Node 2.

Under contract of the Italian Space Agency, Alenia Spazio in Turin, Italy, led a
consortium of European sub-contractors to build the node. It was built for NASA under a
barter agreement with the European Space Agency in exchange for the launch of the European
Columbus Laboratory by the space shuttle to the International Space Station.

The aluminum node is 7.2 meters long and 4.4 meters in diameter. Its pressurized volume
is 70 cubic meters, and its launch weight is approximately 13,600 kilograms.

Node 2 arrived at Kennedy Space Center, Fla. on 1 June 2003 to begin final
preparations for its launch on shuttle mission STS-120, station assembly flight 10A.

Node 3 will contain advanced life support systems. These systems will recycle waste
water for crew use and generate oxygen for the crew to breathe. In addition, Node 3 will
contain an atmosphere revitalization system to remove contaminants from the atmosphere and
monitor/control the atmosphere constituents of the ISS. Node 3 will also contain a Waste
and Hygiene Compartment (toilet) for supporting the on-board crew.

Node 3 is also designed to provide berthing locations with power, data and commanding,
thermal and environmental control, and crew access for more attached habitable volumes or
for crew transportation vehicles or stowage, or an appropriate combination of all of
these.

Node 3 will also have a Cupola attached to it with a Robotic
Work Station inside it to assist in the assembly/maintenance of the ISS as well as offer a
window for Earth observations. Node 3 was launched with the Cupola attached to the
nadir port. After mating with the nadir port of Unity, the Cupola will be moved to the
front port. Node 3 will also have redundant ports for the logistics module or the Space
Shuttle to be berthed.